Abstract: Apart from the effective restraint soils, soilbags have also a function of water filtration and soil conservation, so they can be used to resist foundation soil liquefaction. However, seldom studies have been made on the liquefaction resistance performance of soilbags. A series of shaking table tests was carried out on soilbags-stacked cushion to verify its liquefaction resistance performance and investigate the influence of the vibration acceleration, the layers and arrangements of soilbags on liquefaction resistance. The results show that soilbags have good liquefaction resistance effect, and the excess pore pressure ratio of soil in bags is less than that of the surrounding soil at the same depth. The drainage performance of soilbags is contributed to its good permeability, and the discharge of pore water along the interface between soilbags and foundation soil as well as the gaps among soilbags. Compared with the rigid impervious cushion, the surface of soilbag cushion basically keeps level during the process of vibration, showing better deformation coordination performance. The increase of soilbag layers and the staggered arrangement of soilbags are beneficial to anti-liquefaction.

Key words: soilbag, liquefaction resistance, shaking table test, soilbag layer, arrangement pattern